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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07dd8d83e61282772743d055acbf331400743892671cd0f1304c8b25ae041d2e' 
  AND token = '8e8LoMq/0N4VITl1FwaTjf15Ry8aemzhFUotQCgPiPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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