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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956977519b074d3b64fbca7a01ca35c0f2fef8d00d577a61e740282d0d265624' 
  AND token = 'R9/2ifiX+EYLD5T+07NEfvw0g1N1kpJFImZrZkdirP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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