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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9736cf26fd76b55c47926158721931a3a047239a0377296800038f1b6728a9b' 
  AND token = 'fj7M6IZu/useLrCsm5xqOtdaI7vuvcQerw2ErYyM2+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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