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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9175b4a3f9b577b794bedbad6c249689633c1548c79967c35cd6fceb0f81e9fe' 
  AND token = 'e6Pwm7yhi6wbDBW7g2c/gorl9v+gzALCkxUG/GEfaso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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