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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769dbe014a4c6c4bcc7bfaba3d0721b5053470cb6223dfb3a89068f619415a30' 
  AND token = 'tUZ3NVltEHsMPbXW9Ed9Ng4xYi6VeO2j1F71453AZuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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