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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd709937a129a017480b6c3fe5c768d23afe2610e8295a8d4507dca39b1ee1226' 
  AND token = '/b1vviPxxEJNfK1thV3hxHEaFZWF4T0VbIxlb//67oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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