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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6d3db2d32c018b78e8e6f2fda289246310080b7015ac94f4eae18218f1ab35' 
  AND token = '5/Dq8ZpzN8BrLcFmB30CUzHFEh6aakFxH4hEqqw/O9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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