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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b68123b29d542f05dc658b1772c20396c447d611ae50c83a621a7fa7e6e21b8' 
  AND token = 'aDS6YzX+ILIYtqp2Y8k3a/IeTNDqUn492qIe2vRH8To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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