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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeac997703aa59ed059a6a148bc32145cabdd48ce50982de0b80e15269e48332' 
  AND token = '0l6t0UL86+T44aDHZoBzbwSFfthZZV+p7WmiMrVbM1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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