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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a580ed0202c302d144eeea586ad3be4559ec38cb6547b4342a2f5465e2ae0ed7' 
  AND token = 'N0Own5errZA0ooqSM5fl0Xwz01QBL8B0ucxdXHbRm6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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