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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ad4af070cb3796c080e39b7731e72d5aee7943985e248ba3d75f625f8fd11a' 
  AND token = 'v8MOunV9vsdF1ak3AETOyrxtHfMR6XIDfAR0ccatsXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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