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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3611b6c71109299931728ec01dc933eae5558f1272064ab8e2b1a4c32d01d632' 
  AND token = 'uQgJG5ynzBPLWSc9CJBGpMkForEIY3EGBhBE+M1eqlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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