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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930342e6d68c9756c3c74bd01a40044a0d36f7109460c221e937e98e3f1904a6' 
  AND token = 'vHIGrPPAnNVNmOYtupUgozWi7Mdhuw+4vzJd6PK9pJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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