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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0327c19f85b174c4c6e9920385fe390e92f2f37f766001863288989ee616495' 
  AND token = 'VAmvQ3LkGbUVSFL1QwW6M1417g1qIHVbDNwgSfoTnxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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