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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a60da3cb43ef633bf46f8f3b2cf9099173845dab8344802dd4223392ae73bd' 
  AND token = 'SteHy6llG2K7HRnu0zZlG4dHUKvcWCM6SFIQDL8kXjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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