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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9691e3b13f784b7e4e764d14b985ef88e93adced61b2f872587b595dee17c5c6' 
  AND token = 'mwIe/BBb6WaD2pyb7AlSGBEyX0Qicj2lzPte6Efi5ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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