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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd5a7c0c86711196fefc94d4f4ef2d4bf9060f7539683aca16fd1d5a37f3a77' 
  AND token = 'xpzwcW8k/TSdfbx6oQf7j1NHDuWEqKFx8V7qkc1/C8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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