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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ceb4dba6486bbf4fd7e08697a32ed5005b8295885b2b844f5a83972e6d80af' 
  AND token = '89ic/ilv5UOt66uq+XPaS/PbRhG7RRKL7ZaqFhAceAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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