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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ccad8780c218ebc175df90e741e6a21b553f3b96c8f850867c4640097b7210' 
  AND token = '9aa+m2axBVIwg+k1NP+K7rfm/jEqQrDD7kAQ5A2eaVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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