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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b86b73d4ae643ecbb0fa94420e6f58762ddcca649b696db1cc31fdb89e8b139' 
  AND token = 'fXyMiI04rTbEMA1po50fEp0vF85e983O0oqCdr4UHZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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