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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0191cec9e73f475e5bb8f011a8025053be2657a37a637ea02d470051e0215e9' 
  AND token = 'jISW21GQv+x7/knqOQXsN66rjFyQmAwZDrfg9EJjvbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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