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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7600d25b899b8cabe5422a15f89fe2663d86757cb8eff947f5078bb1294eee' 
  AND token = 'WdV7N5DIWuRQGcG6aWicOXaRUS5deCxZH4umgGUFKxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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