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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979f40f8820dbc08ed9a3d2fd3011d6cc843e42a327420de68b2a5ccc71d062e' 
  AND token = 'HgOMIURNORoGolHfArStyaUtRP1JCtHLfJMTVAvV7lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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