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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a65f38a4e92d66f3c670b7027520eb6687a8f3cfde3cbe3e0a8fe046fc5ddf' 
  AND token = 'm44/13c96vwKzg0TE6HraF9kX8PUUyFPc8F7HoDNGRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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