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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4749f2586cbfff6bddc0f2cda98c5466641d53d728cc5d438b7a2c7b88f53a6a' 
  AND token = 'Q6HmlBhhOMbp09oKCXQKUAx0c/XjnEl0/XB2IWsOjtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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