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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1c6f232ffab4571b3c418ba5197976c78c98d123ca23a3c74bd46e048dc2ee' 
  AND token = 'iItAejTnJC7x4hD7Vi8kUJMgbHzZeoFIB2tbkNBP7Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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