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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf5a525c65e05df6b7f1bbfb891466b34684bfee4106605a0180abc8222e9ea' 
  AND token = 'IAJK7uMfOJH3XM4ftUPO5U0ZQVExH84LWDESHUWG23U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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