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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f84330faa177f4934c29d83ec4fa5d8bd5420b8bd2854ac146d2849f0d363d' 
  AND token = '5ZDXUwNcJRTygbjF5+kRHDkpJFdTylmWnh9zOcT07o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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