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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d54bd95bb81d5790b32bffc1a231c9716f3ae2bdbb39cbc2444cf420b40a08' 
  AND token = '6UwUSLLLa3WQNwiW73S8ntn63rUK+k+WfHbMbsnDT2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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