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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f603c841bab5e13c49c79e57874b6d7f2f82235b65979f7f03eee504bfbf3f44' 
  AND token = 'gwsPvAMnAlFYYqheC/0izrepRKYeDTisNdMd03Hju6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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