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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dad9f4fd21cd5a9c5074955f43c54161f9fae41a287d96e4e477323029404cb' 
  AND token = 'SHyQqD4YqUJfze6EmEg9sXu6Eec1ejfy/cb0wtIsyYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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