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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032d7de6f3c9bef0c68b81d8dd2fa399f8d610201ca244a3770d2eb4ff0d01b3' 
  AND token = 'uF/tpPMDSUurc6WURF6VZHl6gYFg21GUqouvmafcm0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}