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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4a8dcaa9dbdf25c9ef0d3f27ca729ced58a96f8ca379b51348392bc3392e69' 
  AND token = '9WuscAyJBf5SppIh6QS1/mUeB2uHSFf5z9dFGQxSK6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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