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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faca48e0345945ad99069d30e4087ecf6f98a023f5d9e3b1201a339ef7bce97f' 
  AND token = 'qz1p00Om3Bb+kXCU4IANyXbtNG7MjQ1sVBUdKuQLv74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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