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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a36b75b8ee44ccad0cb5e79127e8cb7af70cc2dd7c113a8087b2d2a7369b0ca' 
  AND token = '2B6jFHZ6rRv4Dcet2UZ+ijvR/IRppxmBapPxkfdGr5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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