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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe89b40ba430f0b5c5519af632884393fcccfbc682c5a0335a7c7c4c8cf5c3b2' 
  AND token = 'D9Z24UCxGUhjGXt/omyP+CiH6Fzbxtwilmzx3ymqYUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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