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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c4246424fd26c13a2ad74f080573f665faa89ce5de6b05b1c731160696fe9f' 
  AND token = 'SoMlVedBXBGmTKnGEcDH5vVIwXSetf1TSfri5X4YEAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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