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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20cc8fefd65c2d257e83d1cb75d35c30b5cc29875516dd726cbe37913feb34d' 
  AND token = 'IViDVUsHvvLxTi+4Sc5jUC/CmIPtfWhMicLvpqHJbs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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