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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0960094d89813ea9c0c6f3c299c548b61cded76b1cce14d0d7b9ddfc72c4e6' 
  AND token = 'kUysAZBhfWR+XvX5VasvY2Gn/r9ivp9XZICS0xZ47Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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