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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a553550504c822f4b13ff6561f41afa7d6fea0dbdc6f8f94e9d7cfa9d080bb90' 
  AND token = 'kR+RbQClAaB/Mxnkq3tLiJDeKmdrK00PUhg+a7g7edo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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