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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77aa9960db4761dc684792ce707fc99fe73224dc219cc4129e53c90be8da41b6' 
  AND token = '2vf1HXHhOMH2mE8rSZIWqJ2T4zDYYniKc9yOq5swFb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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