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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0f7478d5f3688bcd7446fe20017538894e039f55c42d1ea5f8f68f8604f9c2' 
  AND token = 'BO0GnnF1VY1l+73Ia6A7GGxyEqaTxKx7MU8khEjb1oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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