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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7003962d9d906ef66d03220b26836464295902eefda59bc63423a5514781d575' 
  AND token = 'cMJfReIi1X8arDgFGXkfnzsTquxrPlrlq+RmsCZ7FAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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