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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebd10a9f5c07abd7fd295d093681fb76330d83594c09b3acf000b95198d273d' 
  AND token = 'fj1lE4gnNAVXYOQWx15zwtr5SXBKb3n5wtmApdoa7HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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