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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcc895cc42493b420c1e34821e9d31058be3303ff58e7238616d8906da745f9' 
  AND token = 'wPTW5NkIchX3rjUxDm4v7bIOrxlUAmqLeMjm3HxQ/Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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