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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb698cf0f0e39d242c935a550b6e27ee5f3a71202e03d7b6b8684ef3cc1197d' 
  AND token = 'cig7xwi1m2EGz3lRq2fnNpE9l9xUQN3zugwfES3xQ4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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