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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7916ab5277e878902b760cd158c5d074fa87b5d8c2b85380c8429c4bc71f57e' 
  AND token = '9oX6ytlfiWmGnPBsIWTanSRkGjRBFEhpDXdxeYRFuak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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