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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479654b4400dbd6654adc7a541e8ef33332c14cb4c5a646a13234c4ad2cd16ea' 
  AND token = 'BA6uUf/t+VrIt6gbdUieGahiClwv6NBN7EGMiPhALgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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