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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecde96d42f330c98aa92ac93dd346d7fa29af16d77279431e026de9a9336557' 
  AND token = 'gHdqbIZRmirOsXnPfcaKGv5qEVfTQGtZi6hvp0KJZ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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