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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee223a51425a3d4a22be9036bf3c5cc1377299fa7999b1f25afbfb03dd083ef' 
  AND token = 'zQXCeXEwtqibu9pBjuBPVhimlV/t9REt7JUhXnE+MEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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