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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d236843720e21e0a18063ac2bafa02ff4a22af128c63943bc3a7fe06424aaea' 
  AND token = '/6Z6zgcw5g1clTlbRw6KSZJaQKD2H7Fzxk9vSZtewWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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