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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3cc502989051363ca4ef59dd9d4435aa5328568a40d2971f1c6d301bf49bd4' 
  AND token = 'F7SevTpBImbCOLIgBxkeVan6C3WH/j3FGpREsfgjMyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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