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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da37d965e2368fa6f3eccf09f1c3872c760c34b8a1daaba447d7de426155bd23' 
  AND token = '3nRjKIIWg1J5LeU87v9QtQr37EnhZymUF4YNibBbwCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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